refactor(report): improve report summary

apps/client/src/common/utils/report.ts

@@ -0,0 +1,29 @@
+import type { MaybeNumber, OntimeEventReport } from 'ontime-types';
+import { dayInMs, MILLIS_PER_SECOND } from 'ontime-utils';
+
+type EventVariance = {
+  actualDuration: MaybeNumber;
+  delta: number;
+  status: 'ontime' | 'over' | 'under' | 'not-run';
+};
+
+const notRun: EventVariance = { actualDuration: null, delta: 0, status: 'not-run' };
+
+export function getReportTimePosition(time: number, day: number): number;
+export function getReportTimePosition(time: MaybeNumber, day: number | null): MaybeNumber;
+export function getReportTimePosition(time: MaybeNumber, day: number | null): MaybeNumber {
+  return time === null || day === null ? null : day * dayInMs + time;
+}
+
+export function getEventVariance(entry: OntimeEventReport | undefined): EventVariance {
+  if (!entry) return notRun;
+
+  const start = getReportTimePosition(entry.startedAt, entry.startedAtDay);
+  const end = getReportTimePosition(entry.endedAt, entry.endedAtDay);
+  if (start === null || end === null) return notRun;
+
+  const actualDuration = end - start;
+  const delta = actualDuration - entry.scheduledDuration;
+  if (Math.abs(delta) < MILLIS_PER_SECOND) return { actualDuration, delta, status: 'ontime' };
+  return { actualDuration, delta, status: delta > 0 ? 'over' : 'under' };
+}